How to add radiogroup onchecked listener in Custom Dialog

Question

I have a custom dialog which contains radio buttons, but when I add a oncheckedchangelistener my app crashes. What could be the problem? Thanks in advance! :D This is my code: ``` GridViewAdapter adapter = new GridViewAdapter(alcoholType.this, images,names); gridView.setAdapter(adapter); gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { final Dialog dialog = new Dialog(context); dialog.setContentView(R.layout.alcoholdialog); dialog.setTitle("ORDER " + names.get(position)); radioQuantity = (RadioGroup) findViewById(R.id.radioQuantity); quantity1 = (RadioButton) findViewById(R.id.quantity1); quantity2 = (RadioButton) findViewById(R.id.quantity2); radioQuantity.clearCheck(); radioQuantity.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() { @Override public void onCheckedChanged(RadioGroup group, int checkedId) { } }); dialog.show(); } }); ``` This is the er…

Accepted Answer

You need to use the `Dialog's` reference to get the view's:

Use:

```
radioQuantity = (RadioGroup) dialog.findViewById(R.id.radioQuantity);
quantity1 = (RadioButton) dialog.findViewById(R.id.quantity1);
quantity2 = (RadioButton) dialog.findViewById(R.id.quantity2);
```

You get `NullPointerException` as your `RadioGroup` is not attached to the view.

Also for the `CheckedListener` use:

```
radioQuantity.setOnCheckedChangeListener(new 
   RadioGroup.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(RadioGroup group, int checkedId) {

if (checkedId == R.id.quantity1) {
                //Your code
            } else if (checkedId == R.id.quantity2) {
                //Your code
            }

}
    });
```

How to add radiogroup onchecked listener in Custom Dialog

Solution

Problem